The Effects of Bright Light Therapy on Adolescent's Sleep Quality and Well-being

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

240 participants

Study Classification

INTERVENTIONAL

Study Start Date

2022-09-05

Study Completion Date

2023-05-31

Brief Summary

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Sleep problems are common among adolescents which can have a variety of serious biological, emotional, cognitive and psychological consequences. Numerous studies have shown that adolescents who suffer from insufficient sleep and poor sleep quality experience decreased mental well-being which is a growing concern in modern societies.

Effective interventions that enhance sleep quality among adolescents are lacking. One possible reason for sleep problems among adolescents is disturbance in the body's circadian rhythms. As light is known to be the main coordinating factor in circadian rhythms, light therapy is an auspicious method which aims to entrain the circadian rhythms, thereby enhancing sleep quality and well-being. Indeed, bright light therapy (BLT) has been shown to be a promising treatment to improve sleep and decrease depressive symptoms among different patient groups. However, BLT interventions among healthy adolescents are needed. Therefore, the current study will investigate whether BLT in classrooms of 16 year old students can improve their sleep quality and well-being. The results from the study can be important as it is the first one to examine whether light intensity in the classroom affects sleep and well-being among adolescents. Furthermore, if the hypothesis will be supported, a simple and relatively inexpensive method can be implemented to promote better sleep quality and thus have an extensive effect on adolescents' well-being.

Aim 1 - Assess whether BLT will improve sleep quality of adolescents. Aim 2 - Assess whether BLT will decrease depressive symptoms in adolescents. Aim 3 - Assess whether BLT will improve mood in adolescents.

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Detailed Description

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Conditions

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Sleep Disturbance Depression Mood Circadian Rhythms

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

SINGLE

Participants

Study Groups

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Experimental light: Sleep quality and well-being

Exposure to experimental systematic light exposure (BWL) in classroom where students are located every school day from 8:30 AM until the school finishes between 3 and 4 PM

Group Type EXPERIMENTAL

BWL classrooms (Experimental)

Intervention Type DEVICE

Adolescents in the BWL classrooms will be exposed to the circadian stimulating bright light (600-1000lx) to maintain alertness. The programming of the LED lighting system in the intervention group (BWL) will be tuned to provide equal stimuli to the cone and melanopsin-containing photoreceptors measured at the eye height (1.2 m above floor level for sitting position) approximately in the range 4500 -5500 K (cool white light) or between 600 and 1000 lx.

Comparison light: Sleep quality and well-being

Exposure to comparison systematic light exposure (DWL) in classroom where students are located every school day from 8:30 AM until the school finishes between 3 and 4 PM

Group Type SHAM_COMPARATOR

DWL classrooms (Comparison)

Intervention Type DEVICE

Participants in DWL classrooms will receive conventional light from the same kind of equipment as used for the intervention group, only not applying high circadian stimulation(300lx). In order to replicate conventional lighting in the classrooms, the programming of the new LED lighting system in the control group (DWL) will meet the minimum requirements according to EN12464-181, or at least 300 lx measured at table height for a light source rated at 3000 K (warm white light).

Unchanged lightning

Conventional lightning in classrooms where students are located every school day from 8:30 AM until the school finishes between 3 and 4 PM

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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BWL classrooms (Experimental)

Adolescents in the BWL classrooms will be exposed to the circadian stimulating bright light (600-1000lx) to maintain alertness. The programming of the LED lighting system in the intervention group (BWL) will be tuned to provide equal stimuli to the cone and melanopsin-containing photoreceptors measured at the eye height (1.2 m above floor level for sitting position) approximately in the range 4500 -5500 K (cool white light) or between 600 and 1000 lx.

Intervention Type DEVICE

DWL classrooms (Comparison)

Participants in DWL classrooms will receive conventional light from the same kind of equipment as used for the intervention group, only not applying high circadian stimulation(300lx). In order to replicate conventional lighting in the classrooms, the programming of the new LED lighting system in the control group (DWL) will meet the minimum requirements according to EN12464-181, or at least 300 lx measured at table height for a light source rated at 3000 K (warm white light).

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* First-year students at the school where the research takes place.
* Participants provide written informed consent.
* Parents or caregivers of participants provide informed consent.
* Read and write Icelandic.